Vat dye.



UNITED STATES PATENT OFFICE.

PAUL THOMASGHEWSKI', 0F VOHWINKEL, NEAR ELIBERFELD, .GEBMANY, ASSIGNOB ITO FAR-BENFAIBRIKEN VORM. FBIEDR. BAYER &

CORPORATION OF GERMANY.

00., OF ELBERFELD, GERMANY, A

. Patented May 30, 1911.

VAT DYE.

993, 735. Specification of Letters Patent.

No Drawing.

Application filed September 27, 1910. Serial No. 583,995.

in which A means an anthra uinone substance are after being dried'anpulverized dark powders soluble in quinolin with from an oran e-red toblue color; soluble in concentrate sulfuric acid generally with areenish color; yielding vats with'hydrosulfite and caustic soda lye,dyeing cotton from red to violet to blue to green fast shades.

In order to illustrate the new process more fully the followin example:is given, the

parts being by weig t: A mixture of 5 parts I ofpara-para-dichlorodiphenylsulfone 15 parts of l-monobenzolaminoi-aminoanthraquinone, 10 parts 0 anhydrous sodium acetate, 0.5parts of ()uCl and 100 parts of naphthalene are heated to boilin during10 hours until the quantity of the dye does no longer increase.Nitrobenzene is added, the new'dye is filtered off from the liquid andwashed with alcohol and then with hot water. It is a violet crystallinepowder soluble in boiling quinolin with a blue, ,in concentratedsulfuric acid witha green color. Upon treatment with hydrosulfite andcanstic soda lye a brown vat is obtained which dyes cotton dark greenshades fast to boiling,,light and chlorin.

The dye obtained from3.3'-dichlorodiphenylsulfone-l-l-aminoanthraquinone dyes red, thatobtained from 3.3-dichlorodiphenylsulfone-i-monobenzoyl-1.4-diaminoanthraguinone dyes violet, that obtained from 4.4-

ichlorodiphenylsulfone and l-aminoanthraquinone'dyes brown-red.

I claim 1. .The herein described new vat dyestuffs obtainable bycondensing'a dihalogendiarylsulfone with an aminoanthraquinone, havingprobably the=f6llowing general formula:

in which A means an anthraquinone substance which dlyes are after beingdried and pulverized dar powders soluble in quinolin with from anorange-red to blue color; being soluble in concentrated sulfuric acidgenerally with a green color; dyeing) cotton fronr the vat from red toviolet to Inc to green shades, substantially as described.

2. The herein described new dye obtainable from paraara-dichlorodiphenylsulfone and two mo ecules ofl-monobenzoylamino-4-aminoanthraquinone,

mecca. concern which is after being dried and ulverized a violetcrystalline powder, solub e in boiling quinolin with a blue color,soluble in concentrated sulfuric acid with a green color; dyeing cottonfrom the hydrosulfite vat dark green shades fast 'to boilin light andchlorin, substantially as descri ed.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing wltnesses.

PAUL momscnrwsrl. [a 5.

Witnesses:

Oms. J. Wmen'r, WALTER VANNEGUT.

